1-GHz operational amplifier with multipath nested Miller compensation

Author

de Langen, K.J. ; Huijsing, J.H.

Author_Institution

Dept. of Electr. Eng., Delft Univ. of Technol., Netherlands

Volume

5

fYear

1994

fDate

30 May-2 Jun 1994

Firstpage

517

Abstract

A monolithic operational amplifier has been realised, which has a unity-gain frequency of 1 GHz. The amplifier is fully compensated for unity-gain feedback, having a phase margin of 60° at 1 GHz. This high bandwidth is the result of an all-NPN signal path. A three-stage configuration reaches a DC-gain of 74 dB in a 50 Ω load, while an efficient frequency compensation technique, the multipath nested Miller compensation preserves the bandwidth. Because of the high bandwidth, the noise is kept as low-as 1.2 nV/√Hz. Finally, the influence of the packaging has been taken into account and a good bonding scheme has been selected, allowing off-chip use of the full bandwidth. The chip was realised in the 10 GHz f_T bipolar part of a BiCMOS process

Keywords

UHF amplifiers; UHF integrated circuits; bipolar analogue integrated circuits; compensation; differential amplifiers; feedback amplifiers; operational amplifiers; wideband amplifiers; 1 GHz; 74 dB; BiCMOS process; UHF operation; bipolar opamp; bonding scheme; frequency compensation technique; high bandwidth; monolithic opamp; multipath nested Miller compensation; operational amplifier; packaging; three-stage configuration; unity-gain feedback; Bandwidth; Broadband amplifiers; Circuits; Cutoff frequency; Degradation; Feedback; Inverters; Operational amplifiers; Packaging; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1994. ISCAS '94., 1994 IEEE International Symposium on

Conference_Location

London

Print_ISBN

0-7803-1915-X

Type

conf

DOI

10.1109/ISCAS.1994.409425

Filename

409425